Attachment-plug



J. J. KENNEY. ATTACHMENT PLUG.

APPLICATION FILE D AUG-7. 1916.

Patented Apr. 27, 1920.

- FIG.2

FIG. 1

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FIG.3

FIG-4 INVENTOR UNITED sTATEs PATENT oEEIcE.

JOHN J'. KENNEY, OF PITTSBURGH, PENNSYLVANIA, JASSIGrNOIR, TO BEST ELECTRIC COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF DELAWARE.

ATTACHMENT-PLUG'.

To all whom it may concern:

Be it known that I, JOHN J. KENNEY, a resident of Pittsburgh, in. the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in .Attachment-Plugs, of which the following designed to make the plug in one structure,

which is not to be disassembled except for the first connection to conducting wires, and

in which all of the parts are normally relatively immovable. F'urther objects are to provide ellicient insulation between the conducting parts, and means for engaging the hconductor wires to 'remove all strain on their binding posts. These, and other objects which will appear more fully hereinafter, and which will be `obvious to persons familiar with such devices, are attained by a construction, an

embodiment of which is shown inthe drawings.

Figure 1 is a central vertical section through the plug assembled; Fig. 2 is a central vertical section at right angles to the section 'of Fig. 1; Fig. 3 is a horizontal section on the line 3-3l of Fig. 1; and Fig. 4 is a diagrammatic end view of the plug.

The main body member, 1, of the plug is made of any suitable insulating material, such as glass, porcelain, rubber or composition. It is preferred to use a material such as composition or rubber, which may be molded to the desired shape atone operation. This part 1 has a central axial opening 2, adapted for the entrance of the ordinary conductor cord. This opening extends about half the length of the .base member, and then opens into lateral recesses 3 and 4, which are channeled out of the sides of the base member, being shaped as shown in Figs. 1 and 3. At the bottom of the bore 2 is a smaller concentric bore 5 which extends deep enough to receive a metal lnsert 17 as below described.

Specification of Letters Patent. Patented API- 27, 1920, Application led August 7, 1916. Serial No. 113,507.

seating therein. The bore then continues,

with a smaller diameter 6 throughout the base. f

Inv the recess 3 a terminal member 7 is posltioned. This is stamped romsheet metal, and has a threaded hole adapted to receive a binding post 8, and has a portion adjacent'to the head of this binding screw bent outwardly to form a retaining abut- `Vment 9, which has on the under side a notch 9a, adapted to receive the conductor cord, as shown in Fig. 1. The lower end of 'the plate 7 is bent at a right angle to the post-carrying portion, and is adapted to extend across the bottom of the base of the insulating member, 'having a central opening 10 therein concentric with the bore 6, and having transverse wings 11 extending diametrically fromthis central opening, as shown in Fig. 4. rlhe ends of these wings have holes 12 adapted to receive screws 13,

The recess 4 houses another terminal conducting member 14, stamped from sheet right angles across the center of the base,

and has a hole therein alined' with the `bore 6.

The terminal member 7 is first placed in position, an insulating ring 18 is itted into the opening 10, and another annular insulating member 19, having a central opening is alined with bore 6. The terminal member 14 is then placed in position in the recess 4, with its transverse portion across the insulating member 19, and with its opening alined with the bore through the insulating base and member 19. A screw 20 is then passed through members 14, 19,18 and the base 1, and is threaded into the insert 17, above described. This binds all of the parts mentioned rigidly in the relative positions shown in Fig. 1.

Conductor wires are led in through the opening 2, passing under the abutments and engaging the notches therein, and then made fast to the binding posts, as will be'obv'ious.

ing 22 in its bottom, and containing an interior insulating sleeve, or shell 22, is then slipped over the base; This threaded 4 shell bears against the conducting member 7, and the screws 13 pass through openings in the shell and are threaded into the member 7, as above described. The opening 22 is cut away, as shown in Fig. 4, to give ample clearance for passage therethrough of the conducting terminal 14., By this arrangement the terminal 7 is directly connected to the outer contact shell 21, and the conductor terminal 14 is insulated therefrom and in position to contact with the central terminal of the socket in which the plug is used.

It will be observed that access to the binding posts for insertion or removal of conducting `wires is readily obtained by withdrawing the screws 13, and slipping off the shell 21. This leaves the binding posts completely exposed, and any changes may be made, without further disassembling the plug. Furthermore, the notched abutment about which the conductor Wires are led before being engaged by the binding posts, gives a complete doubling upon itself to the wires. This takes practically all strain off the binding posts.

An annular rib 23 is provided around the .upper end of the base, and is preferably vroughened, or corrugated, to form a suitable hand-hold.

I claim f 1. A solid attachment plug, comprising an integral insulating base having a Vcentral bore for receiving conductor wires and.lat.

eral longitudinal recesses for housing conductor termlnals, termmals 1n said recesses having their lower ends bent over across,

the end of the base andone of them forming the central contact of the plug, a sepaan outer contact shell, conductor terminals carrying binding screws and having lateral wings turned over to form abutments having notches therein adapted to receive conductor cords passed around the abutments to the binding screw.

In testimony whereof, I have hereunto set my hand.

. JOHN J. KENNEY. Witnesses:

C. O. VETTER, F. W. WINTER. 

